Quick answers
- Where does Mark Seigel see patients?
- Medicare's clinician data lists 10 practice locations, including North Bethesda, MD, Rockville, MD and Germantown, MD. Call before your visit to confirm the address.
- What is Mark Seigel's specialty?
- Medicare lists Obstetrics/Gynecology as the primary specialty.
- Does Mark Seigel accept Medicare assignment?
- Yes. Medicare's clinician data says Mark Seigel accepts Medicare assignment (the Medicare-approved amount as full payment for covered services), as of 2026-10-02. Ask the office to confirm before your visit.
- What is the phone number for Mark Seigel?
- (301) 881-3260, as listed in official Medicare / NPI Registry data.
- What is Mark Seigel's NPI number?
- 1366540080. The NPI (National Provider Identifier) is the clinician's permanent federal ID; you can look it up in the official NPI Registry.
Practice locations
Addresses where Mark Seigel is enrolled with Medicare (CMS data updated 2026-10-02). The first 5 of 10; the Medicare profile lists all.
- 11200 Rockville Pike, Suite 205North Bethesda, MD 20852 (301) 881‑3260
- 121 Congressional LnRockville, MD 20852
- 12800 Middlebrook Rd, Suite 333Germantown, MD 20874 (301) 279‑9400
- 15225 Shady Grove Rd, Suite 306Rockville, MD 20850 (301) 869‑7644
- 2301 Research Blvd, Suite 210Rockville, MD 20850 (301) 569‑6301
Group practices
Medicare enrollment lists Mark Seigel as a member of this group (CMS data updated 2026-10-02).
- Capital Womens Care LLC281 clinicians in the group
Specialties
- Obstetrics/Gynecologyprimary
Other OB-GYNs in North Bethesda
Clinicians with the same Medicare primary specialty in North Bethesda, MD — not a recommendation.
Clinician information
| Credential | MD |
|---|---|
| Medical school | Perelman School Of Med At The University Of Pennsylvania |
| Graduation year | 1977 |
| Gender (as listed) | Male |
| Medicare assignment | Accepts (Medicare-approved amount as full payment) |
| NPI (National Provider Identifier) | 1366540080 |
| Corrections | Report an error or suggest an update → |
Most corrections must be made at the source: clinicians update their NPI Registry record (NPPES) and their Medicare enrollment (PECOS); this page follows the next data release.
Sources
- National Downloadable File (Doctors and Clinicians) — CMS, data updated 2026-10-02, retrieved 2026-10-29
- NPI Registry — U.S. Department of Health and Human Services (NPPES), the clinician’s official record
- Medicare Care Compare — official Medicare tool to look up clinicians